Monstrous Regiment may refer to:
Monstrous Regiment is the 31st novel in Terry Pratchett's Discworld series. It takes its name from the anti-Catholic 16th century tract by John Knox, the full title of which is The First Blast of the Trumpet Against the Monstrous Regiment of Women.
The cover illustration of the British edition, by Paul Kidby, is a parody of Joe Rosenthal's photograph Raising the Flag on Iwo Jima. Monstrous Regiment was nominated for a Locus Award in 2004.
The bulk of Monstrous Regiment takes place in the small, bellicose country of Borogravia, a highly conservative country, whose people live according to the increasingly strange (and harmful) decrees of its favored deity, Nuggan. The main feature of his religion is the Abominations; a long, often-updated list of banned things. To put this in perspective, these things include garlic, cats, the smell of beets, people with ginger hair, shirts with six buttons, anyone shorter than three feet (including children and babies), sneezing, rocks, ears, jigsaw puzzles, chocolate (which was once Borogravia's staple export, plunging the country into increasing poverty), and the colour blue.